go through hell and high water

go through hell and high water  {v. phr.},  {informal}

Подвергаться опасности, иметь неприятности, преодолевать трудности.

John is ready to go through hell and high water to help his chum.

The soldiers went through hell and high water to capture the fort.

Ср.: COME HELL OR HIGH WATER, THROUGH THE MILL.